Did You Know Your Browser’s Autofill Credentials Could Be Stolen via Cross-Site Scripting (XSS)

Do you use browser autofill enabled to save time? Well, if you are not careful you might be susceptible to XSS by just filling out a password or login form.

All browsers let you fill in web forms with account and password information. The user usually selects which data to save for the web form, for example email and password. This default is usually stored locally on your browser’s web form data.

Whether we are browsing sites on our PCs or mobile devices, browser autofill is an essential feature in fighting tedious repetitive activities. But what is browser autofill? The Autofill functionality can be defined as a way to collect and store data so that it can be easily recaptured at some future time. This article will review all the elements of risks around Browser Autofil so you may take a clearer perspective on the security of your data.

We all use browsers to save us time by automatically filling out personal information in forms, logging in to social media accounts, and more. We take this convenience for granted, as there is a downside that can come back and bite at our security. This blog article will explore some of the possible scenarios where attackers might gain access to your browser’s autofill content.

Cross-site scripting is a type of vulnerability that can be found on any webpage nowadays. Any website you access can potentially inject malicious JavaScript onto your browser and steal data from your browser to send back to the attacker. What does this have to do with autofill credentials? Well, if a website manages to get access to your autofill credentials by means of cross-site scripting and you want to log in with them, it will fill out all the information for you like normal and submit the form automatically!

Introduction: What is Cross Site Scripting?

When you visit a website, your browser shares certain information with the site’s server. This includes things like your IP address, what type of device you are using, and your browsing history. Most browsers also allow websites to set cookies, which are small pieces of data that are stored on your computer and used to remember certain information about your online activity.

Cross-site scripting (XSS) is a type of security vulnerability that allows attackers to inject malicious code into webpages viewed by other users. When someone visits a page containing malicious code, the code can be executed by their browser and the attacker can gain access to their sensitive information, such as login credentials or financial data. XSS attacks can also be used to hijack user sessions or redirect users to malicious websites.

There are two main types of XSS attacks: persistent and non-persistent. Persistent XSS attacks occur when the malicious code is injected into a website’s database or server-side script, such as PHP. This means that every time the page is loaded, the code will be executed by the victim’s browser. Non-persistent XSS attacks occur when the malicious code is injected into a webpage’s client-side script, such as JavaScript. This means that the code is only executed when the victim visits the specific webpage containing the attack.

One of the most common methods of XSS attack is through unprotected forms on websites. Attackers can

What are the risks of XSS?

When using a web browser, it is important to be aware of the risks of cross-site scripting (XSS). XSS attacks can occur when a malicious script is injected into a web page that is then viewed by another user. This can allow the attacker to steal sensitive information, such as login credentials, from the unsuspecting user.

There are several ways in which an attacker could inject a malicious script into a web page. One common method is to exploit vulnerabilities in web applications. Another way is to embed malicious code into an ad that is displayed on the web page.

Once the attacker has injected the malicious script into the web page, it will be executed when the unsuspecting user views the page. The script can then steal sensitive information from the user, such as login credentials or other personal information. In some cases, the attacker may also be able to use the stolen information to gain access to other accounts or systems.

XSS attacks can be difficult to detect and prevent. However, there are some measures that can be taken to reduce the risk of being attacked. For example, users should only enter their credentials into websites that they trust and they should ensure that their browsers are up-to-date with all security patches. Additionally, website owners can take steps to protect their sites from XSS attacks by implementing proper input validation and output encoding rules.

What is Autofill?

Autofill is a feature in web browsers that allow users to save and automatically fill in form data, such as their name, address, and payment information. This can be a convenient way to speed up the process of filling out forms, but it can also be a security risk.

If autofill is enabled, your browser will save the information you enter into forms and use it to automatically fill out future forms. This means that if you save your credit card information in your browser’s autofill, it could be used to make unauthorized purchases without your knowledge. Additionally, if your autofill credentials are stolen via cross-site scripting (XSS), an attacker could gain access to sensitive information like your credit card number and billing address.

To protect yourself from these risks, it’s important to only use autofill with trusted websites and to never save sensitive information like your credit card number in your browser’s autofill. If you’re concerned about the safety of your autofill data, you can always clear it from your browser’s settings.

Why You Should Use the “No Autocomplete”

If you’re like most people, you probably use your browser’s autofill feature to save time when filling out online forms. After all, who wants to waste time typing in their name, address, and credit card information every time they make a purchase online?

Unfortunately, autofill credentials can be stolen via cross-site scripting (XSS) attacks. In an XSS attack, malicious code is injected into a web page that is then executed by the browser. This can allow attackers to steal autofill information that is stored in the browser.

There are a few things you can do to protect yourself from XSS attacks, but one of the best is to simply disable the autofill feature in your browser. This will prevent your autofill information from being stored in the browser and thus prevent it from being stolen in an XSS attack.

Types of Browser Autofill Credentials

Users of the Chrome, Edge, and Safari browsers may be familiar with the autofill feature, which fills in form data based on previous entries. Autofill is a convenient time-saver, but did you know that your browser’s autofill credentials could be stolen via cross-site scripting (XSS)?

Autofill works by storing your credentials (including personal information like your name, address, and credit card number) in the browser’s memory. When you visit a website that has forms requiring this information, the browser will automatically fill in the fields for you.

However, if a malicious website uses XSS to inject JavaScript into the page, it can access this stored information and send it to a third-party server without your knowledge or consent. This means that your personal information could be compromised without you even realizing it.

To protect yourself from this type of attack, make sure to only enter your personal information into websites that you trust. If you’re not sure whether a website is secure, look for indicators like https:// in the URL or a green padlock icon in the address bar. These signs indicate that the website is using SSL/TLS encryption to protect your data.

You can also use a password manager like LastPass or 1Password to generate unique passwords for each site you visit and store them securely in one place. That way, even if your autofill credentials are stolen, they

How Does a Browser Autofill Work?

When you type something into a web form, your browser will often offer to save it as a ” autofill “. This is a convenience feature that can save you time when filling out forms, but it also poses a security risk.

Autofill works by storing the data you enter into web forms in your browser’s memory. When you come across a form that asks for the same information, your browser will automatically fill in the fields for you.

This is convenient, but it also means that your autofill data is stored locally on your computer. If someone were to gain access to your computer, they could easily retrieve your autofill data and use it to their advantage.

One way that hackers can gain access to your autofill data is through cross-site scripting (XSS). XSS attacks occur when malicious code is injected into a website. This code can then be used to steal information from visitors of the site.

In order to protect yourself from XSS attacks, it’s important to keep your browser up-to-date and make sure that you’re only visiting websites that you trust. Additionally, consider using a password manager instead of relying on your browser’s autofill feature.

How Does Cross Site Scripting Work

When a browser autofills credentials on a website, the information is stored locally on the device in what is known as a “cookie”. This cookie is then read by the browser when the user visits other websites that have similar fields (such as a username and password).

If an attacker can find a way to inject malicious code into these fields on a website, they can steal the autofilled information from unsuspecting users when they visit. This type of attack is known as “cross-site scripting” (XSS).

To prevent this type of attack, it’s important to only enter your credentials into websites that you trust. Additionally, you should always use a strong password and never reuse passwords across different sites.

How Could It Be Possible to Steal My Credentials?

It’s possible for an attacker to steal your browser’s autofill credentials via cross-site scripting (XSS), meaning that if you use a vulnerable browser and visit a malicious website, your credentials could be compromised.

Attackers can exploit XSS vulnerabilities to run malicious code on a website that unsuspecting users visit. This malicious code can then steal the users’ autofill credentials, which are stored in the browser and used to automatically fill in username and password fields on websites.

There are a few ways to protect yourself from this type of attack:

• Use a browser that doesn’t store autofill credentials, or disable the autofill feature if your browser does store them.

• Be careful which websites you visit, and don’t enter your autofill credentials on any site that looks suspicious.

• Keep your web browser up to date, as new versions often include fixes for XSS vulnerabilities.
In general, it’s a good idea to exercise caution when using any feature that stores your credentials in an easily accessible place, such as your web browser. If possible, use a password manager instead of autofill to store your sensitive login information.


You should now be aware of the dangers of autofill credentials and how they can be stolen via cross-site scripting. Be sure to only use reputable browsers and websites that you trust. If you are unsure about a website, do some research to make sure it is safe before entering your information. And always remember to log out of websites when you are finished using them.

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